make pkg scripts optional
make pkg scripts optional

lvfeng1130/omnibus,Altiscale/omnibus,lvfeng1130/omnibus,rapid7/omnibus,szechyjs/omnibus,chef/omnibus,hugosato/omnibus,servebox/omnibus,sh9189/omnibus,mattray/omnibus,Scalr/omnibus,mattray/omnibus,servebox/omnibus,jamesn/omnibus,szechyjs/omnibus,Altiscale/omnibus,higanworks/omnibus,servebox/omnibus,strangelittlemonkey/omnibus,3ofcoins/chef-omnibus,3ofcoins/chef-omnibus,ashhher3/omnibus,intfrr/omnibus,strangelittlemonkey/omnibus,chef/omnibus,DataDog/omnibus-ruby,adamleff/omnibus,Scalr/omnibus,sh9189/omnibus,Altiscale/omnibus,mattray/omnibus,ashhher3/omnibus,pskrz/omnibus,chef/omnibus,intfrr/omnibus,DataDog/omnibus-ruby,rhass/omnibus,hugosato/omnibus,jamesn/omnibus,3ofcoins/chef-omnibus,rhass/omnibus,sh9189/omnibus,rapid7/omnibus,pskrz/omnibus,ashhher3/omnibus,adamleff/omnibus,higanworks/omnibus,intfrr/omnibus,rapid7/omnibus,higanworks/omnibus,hugosato/omnibus,strangelittlemonkey/omnibus,szechyjs/omnibus,DataDog/omnibus-ruby,jamesn/omnibus,pskrz/omnibus,Scalr/omnibus,rhass/omnibus,lvfeng1130/omnibus,adamleff/omnibus